Apply @appcypher's recommendations for microsandbox Docker configuration

Co-authored-by: Sun-ZhenXing <44517244+Sun-ZhenXing@users.noreply.github.com>

builds/microsandbox/Dockerfile

@@ -2,7 +2,7 @@ ARG DEBIAN_VERSION=13.2-slim
 FROM debian:${DEBIAN_VERSION}
 
 ARG DEBIAN_FRONTEND=noninteractive
-ARG MICROSANDBOX_VERSION=0.2.6
+ARG MICROSANDBOX_VERSION
 ARG TARGETARCH
 
 RUN apt update && \
@@ -12,32 +12,22 @@ RUN apt update && \
     apt clean && \
     rm -rf /var/lib/apt/lists/*
 
-# Download and install microsandbox binary based on architecture
-RUN ARCH=${TARGETARCH:-amd64} && \
-    case "${ARCH}" in \
-        amd64) MICROSANDBOX_ARCH="x86_64" ;; \
-        arm64) MICROSANDBOX_ARCH="aarch64" ;; \
-        *) echo "Unsupported architecture: ${ARCH}" && exit 1 ;; \
-    esac && \
-    curl -fsSL "https://github.com/zerocore-ai/microsandbox/releases/download/microsandbox-v${MICROSANDBOX_VERSION}/microsandbox-${MICROSANDBOX_VERSION}-linux-${MICROSANDBOX_ARCH}.tar.gz" \
-    -o /tmp/microsandbox.tar.gz && \
-    mkdir -p /usr/local/bin /usr/local/lib && \
-    tar -xzf /tmp/microsandbox.tar.gz -C /tmp && \
-    cd /tmp/microsandbox-${MICROSANDBOX_VERSION}-linux-${MICROSANDBOX_ARCH} && \
-    mv ms* /usr/local/bin/ && \
-    mv *.so.* /usr/local/lib/ && \
-    chmod +x /usr/local/bin/ms* && \
-    rm -rf /tmp/microsandbox*
+# Install microsandbox using the official install script
+# This ensures we always get the latest version if MICROSANDBOX_VERSION is not set
+# and handles architecture detection automatically
+RUN VERSION="${MICROSANDBOX_VERSION:-}" \
+    curl -fsSL https://raw.githubusercontent.com/zerocore-ai/microsandbox/refs/heads/main/scripts/install_microsandbox.sh | sh
 
 # Setup directories for root user
 RUN mkdir -p /root/.local/bin /root/.local/lib /root/.microsandbox
 
-# Set up environment variables (based on setup_env.sh)
+# Set up environment variables
 ENV PATH="/root/.local/bin:/usr/local/bin:${PATH}"
 ENV LD_LIBRARY_PATH="/root/.local/lib:/usr/local/lib:${LD_LIBRARY_PATH}"
 ENV HOME="/root"
 
-WORKDIR /root
+# Set working directory to match docker-compose working_dir
+WORKDIR /workspace
 
 ARG MICROSANDBOX_AUTO_PULL_IMAGES=true
 RUN if [ "${MICROSANDBOX_AUTO_PULL_IMAGES}" = "true" ]; then \